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Efficient Suppression of Chain Transfer and Branching via Cs-Type Shielding in a Neutral Ni(II) Catalyst

Efficient Suppression of Chain Transfer and Branching via Cs-Type Shielding in a Neutral Ni(II) Catalyst

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WANG, Chaoqun, Xiaohui KANG, Shengyu DAI, Fengchao CUI, Yunqi LI, Hongliang MU, Stefan MECKING, Zhongbao JIAN, 2020. Efficient Suppression of Chain Transfer and Branching via Cs-Type Shielding in a Neutral Ni(II) Catalyst. In: Angewandte Chemie International Edition. Wiley. ISSN 1433-7851. eISSN 1521-3773. Available under: doi: 10.1002/anie.202013069

@article{Wang2020-11-17Effic-51877, title={Efficient Suppression of Chain Transfer and Branching via Cs-Type Shielding in a Neutral Ni(II) Catalyst}, year={2020}, doi={10.1002/anie.202013069}, issn={1433-7851}, journal={Angewandte Chemie International Edition}, author={Wang, Chaoqun and Kang, Xiaohui and Dai, Shengyu and Cui, Fengchao and Li, Yunqi and Mu, Hongliang and Mecking, Stefan and Jian, Zhongbao} }

Jian, Zhongbao Efficient Suppression of Chain Transfer and Branching via Cs-Type Shielding in a Neutral Ni(II) Catalyst Kang, Xiaohui 2020-11-19T08:38:13Z Mecking, Stefan Mecking, Stefan Cui, Fengchao Mu, Hongliang Li, Yunqi Dai, Shengyu An effective shielding of both apical positions of a neutral Ni(II) active site is achieved by dibenzosuberyl groups, both attached via the same donors' N -aryl group in a C s -type arrangement. The key aniline building block is accessible in a single step from commercially available dibenzosuberol. This shielding approach suppresses chain transfer and branch formation to such an extent that ultrahigh molecular weight polyethylenes (5 × 10 6 g mol -1 ) are accessible, with a strictly linear microstructure (< 0.1 branches/1000C). Key features of this highly active (4.3 × 10 5 turnovers h -1 ) catalyst are an exceptionally facile preparation, thermal robustness (up to 90 o C polymerization temperature), ability for living polymerization and compatibility with THF as a polar reaction medium. Jian, Zhongbao terms-of-use eng 2020-11-17 Mu, Hongliang Cui, Fengchao 2020-11-19T08:38:13Z Wang, Chaoqun Dai, Shengyu Wang, Chaoqun Li, Yunqi Kang, Xiaohui

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